An ECL Gate Array Realization of a Computer for Real Time Speech Synthesis.

摘要

This note describes the Lincoln Integrated Speech Synthesizer (LISSYN), a general-purpose computer intended for speech processing, whose central processor is made from ECL gate arrays (large scale integrated circuits custom built at Lincoln Laboratory). The goal was to use gate arrays to implement in real time the synthesis portion of a linear predictive vocoder operating at 4800 bits/sec. The design process stressed minimizing the number of different kinds of gate arrays and the number of non-gate-array circuit packages. The result is a general purpose computer structure featuring: single 1024 x 16 memory for data and program, 200 nsec instruction cycle, 950 nsec add/shift multiply, binary serial input, analog output via a 12-bit D/A converter and desampling filter, 0.35 cu. ft. volume, 60 watts DC power, 11 gate arrays of 5 types, 30 memory IC's, 27 other circuit packages. The LISSYN runs the linear predictive speech synthesis in 43% of real time. (Author)